It could have unique features such as a non - linear storyline. This means that the player can make choices that lead to different outcomes, making each playthrough unique. Also, it might have a very distinct soundtrack that sets the mood for different scenes. And perhaps its dialogue system is designed in a special way, like having different tones or voices for different emotions of the characters.
Since I haven't experienced 'starless visual novel' directly, it's hard to say for sure. However, some possible unique features could be its use of color palette. Maybe it uses a very specific set of colors to create a certain atmosphere throughout the story. Another unique aspect could be its use of symbolism. The visual elements could be filled with symbols that represent deeper meanings within the story. Also, the way it presents character development could be different. Instead of a traditional linear growth, it might use flashbacks or side - stories to show how a character has changed over time.
I'm not sure. But it might have unique art styles or character designs.